Title
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Direct observation and structural characterization of natural and metal ion-exchanged HEU-type zeolites
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Author
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Abstract
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The atomic structure of natural HEU-type zeolite and two ion-exchanged variants of the zeolite, Ag+ (Ag-HEU) and Zn2+ (Zn-HEU) ion exchanged HEU-type zeolites, are investigated using advanced transmission electron microscopy techniques in combination with X-ray powder diffraction and X-ray absorption fine structure measurements. In both ion-exchanged materials, loading of the natural HEU zeolite is confirmed. Using low-voltage, aberration-corrected transmission electron microscopy at low-dose conditions, the local crystal structure of natural HEU-type zeolite is determined and the interaction of the ion-exchanged natural zeolites with the Ag+ and Zn2+ ions is studied. In the case of Ag-HEU, the presence of Ag+ ions and clusters at extra-framework sites as well as Ag nanoparticles has been confirmed. The Ag nanoparticles are preferentially positioned at the zeolite surface. For Zn-HEU, no large Zn(O) nanopartides are present, instead, the HEU channels are evidenced to be decorated by small Zn(O) clusters. (c) 2015 Elsevier Inc. All rights reserved. |
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Language
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English
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Source (journal)
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Microporous and mesoporous materials: zeolites, clays, carbons and related materials. - Amsterdam
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Publication
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Amsterdam
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2015
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ISSN
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1387-1811
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DOI
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10.1016/J.MICROMESO.2015.01.043
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Volume/pages
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210
(2015)
, p. 185-193
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ISI
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000353733300024
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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